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Business Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 02, 2025 | Apr. 01, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Mar. 31, 2026 | Jan. 30, 2026
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 11,278 |  | $ 11,316 |
Disposed of by sale | Norway Disposal Group |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration for disposal of business |  |  |  |  |  | $ 821
Divested net assets |  |  |  |  |  | $ 140
Gain on remeasurement to fair value |  |  |  |  | 480 |
Accumulated other comprehensive loss in charge for remeasurement to fair value |  |  |  |  | $ 164 |
PRISM Vision LLC |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Controlling interest acquired (as a percent) |  | 80.00% |  |  |  |
Cash payments to acquire business |  | $ 875 |  |  |  |
Redeemable noncontrolling interests |  | 25 |  |  |  |
Intangible assets |  | 510 |  |  |  |
Goodwill |  | 437 |  |  |  |
PRISM Vision LLC | Redeemable Noncontrolling Interests |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interests |  | $ 25 | 0 | $ 25 |  |
PRISM Vision LLC | PRISM Vision Physicians |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership retained (as a percent) |  | 20.00% |  |  |  |
Core Ventures |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Controlling interest acquired (as a percent) | 70.00% |  |  |  |  |
Cash payments to acquire business | $ 2,481 |  |  |  |  |
Redeemable noncontrolling interests | 700 |  |  |  |  |
Intangible assets | 2,310 |  |  |  |  |
Goodwill | $ 752 |  |  |  |  |
Core Ventures | Redeemable Noncontrolling Interests |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Redeemable noncontrolling interests |  |  | $ 0 | $ 700 |  |
Core Ventures | FCS Physicians |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ownership retained (as a percent) | 30.00% |  |  |  |  |
Exercisable term (in years) | 5 years |  |  |  |  |

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